C Program to Sort Names in Alphabetical Order

In this tutorial, you will learn and get code for sorting given names by user (at run-time) in alphabetical order. For example, if the user provides the following five names as input:

Then the output will be

As you can see, all five names get arranged in alphabetical order (ascending). Let's move on and implement it in a C program.

int main()
   char str[5][20], t[20];
   int i, j;
   printf("Enter any string (5 names):\n");
   for(i=0; i<5; i++)
      scanf("%s", str[i]);
   for(i=1; i<5; i++)
      for(j=1; j<5; j++)
         if(strcmp(str[j-1], str[j])>0)
            strcpy(t, str[j-1]);
            strcpy(str[j-1], str[j]);
            strcpy(str[j], t);
   printf("\nStrings (Names) in alphabetical order:\n");
   for(i=0; i<5; i++)
      printf("%s\n", str[i]);
   return 0;

The program was written in the Code::Blocks IDE; therefore, after a successful build and run, here is the sample run:

c program sort string

Now supply any five names as a string and press the ENTER key to see the string with each word sorted in alphabetical order as shown here in the second snapshot.

You have to provide all five names one by one as a string. That is, enter the first name, say Emma, and hit the ENTER key; then enter the second name, say William, and hit the ENTER key; and so on.

c sort words in alphabetical order

As the function used here to get the string input from the user is scanf(), you can also provide all 5 names as a string in one line, saying Emma William Alexander Sophia Benjamin. Here is the final snapshot of the sample run in this case:

sort each word in string alphabetical order

Here are some of the main steps used in the above program:

C Quiz

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